Rotary system mounted piezoelectric generator, self-powered wireless communication terminal and wireless communication system

A rotary system mounted piezoelectric generator comprising:

• a beam in which a whole or part thereof is formed of a piezoelectric material and whose one end is provided in a rotation system;
• and
• a weight which is attached to the other end of the beam,
• wherein the beam is formed by a folded structure in which the beam is extended from an installation point of the rotation system to the weight toward a direction of a rotation center of the rotation system such that when the rotation system is rotated, a centrifugal force applied to the weight is modulated by a second force other than the centrifugal force,
• a degree of freedom of motion of the weight when seen from the rotation system is two or more-dimensional and
• the beam is constantly deformed so as to correspond to a variation in a sum of a vector of the centrifugal force which is changed according to a number of revolutions of the rotation system and which is applied to the weight and a vector of the second force which does not depend on the number of revolutions of the rotation system such that a rotation center of the weight is moved according to the number of revolutions of the rotation system with the degree of freedom which is two or more-dimensional and that a locus of the weight can be changed.